When do I move her to a 20 gallon?

[Calift]

I have a ball python who is a few months old, around 125 grams. She's a in a ten gallon tank, but I've had an empty 20 gallon (long) for quite some time when she's big enough.

At what size do you guys more your balls to larger enclosure?

[mainbutter]

I started my BP off(got her at 3 mo old) in a 20 gallon long. You should be fine as long as she continues to eat.